WO2000070276A1 - Pointeau motorise pour circuit frigorifique et circuit frigorifique equipe du pointeau motorise - Google Patents

Pointeau motorise pour circuit frigorifique et circuit frigorifique equipe du pointeau motorise Download PDF

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Publication number
WO2000070276A1
WO2000070276A1 PCT/JP2000/003042 JP0003042W WO0070276A1 WO 2000070276 A1 WO2000070276 A1 WO 2000070276A1 JP 0003042 W JP0003042 W JP 0003042W WO 0070276 A1 WO0070276 A1 WO 0070276A1
Authority
WO
WIPO (PCT)
Prior art keywords
needle
refrigerant
electric
valve
hole
Prior art date
Application number
PCT/JP2000/003042
Other languages
English (en)
Japanese (ja)
Inventor
Ryuzaburo Yajima
Nobuo Domyo
Hajime Esumi
Shigeharu Taira
Original Assignee
Daikin Industries, Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Daikin Industries, Ltd. filed Critical Daikin Industries, Ltd.
Priority to CA002373185A priority Critical patent/CA2373185A1/fr
Priority to AU46126/00A priority patent/AU771213B2/en
Priority to US09/959,846 priority patent/US6701744B1/en
Priority to EP00927748.4A priority patent/EP1178270B1/fr
Priority to ES00927748.4T priority patent/ES2663493T3/es
Publication of WO2000070276A1 publication Critical patent/WO2000070276A1/fr
Priority to HK02103865.4A priority patent/HK1042135A1/zh

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
    • F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
    • F16K31/0686—Braking, pressure equilibration, shock absorbing
    • F16K31/0693—Pressure equilibration of the armature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • F25B41/31—Expansion valves
    • F25B41/34—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • F25B41/31—Expansion valves
    • F25B41/34—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators
    • F25B41/35—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators by rotary motors, e.g. by stepping motors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Definitions

  • the present invention relates to an electric needle valve used for controlling a flow rate of a refrigerant in a refrigeration circuit, and a refrigeration apparatus including the electric needle valve.
  • FIG. 14 shows the structure of the electric expansion valve Zo used for controlling the flow rate of the refrigerant in the refrigeration circuit. Note that, for the description of the present invention described later, this conventional general electric expansion valve Z is used. The structure of will be described specifically.
  • the electric expansion valve Z is shown.
  • the valve body 1 has a large-diameter flow passage forming portion 1a located at one end in the axial direction, a small-diameter screw forming portion 1c located at the other end, and a screw formed with the flow passage forming portion 1a. It is configured as a different diameter body having a middle diameter shoulder portion 1b located in the middle of the forming portion 1c.
  • the shoulder 1 b and the screw forming portion 1 c are inserted into the internal space 30 of the case 3 through an opening 33 formed on one end surface of the case 3.
  • the valve body 1 is integrated with the case 3 with the shoulder lb and the thread forming portion 1c inserted into the case 3.
  • a refrigerant flow path 9 is provided in the flow path forming portion 1a of the valve body 1.
  • the refrigerant flow path 9 is composed of a refrigerant introduction part 11 and a refrigerant discharge part 12 which are substantially orthogonal.
  • a valve seat portion 15 is formed at an edge of the refrigerant introduction portion 11.
  • a refrigerant introduction pipe 13 is connected to the refrigerant introduction section 11, and a refrigerant extraction pipe 14 is connected to the refrigerant introduction section 12.
  • the valve body 1 is formed with a 21 dollar fitting hole 16 having a predetermined diameter.
  • the needle fitting hole 16 is formed from the refrigerant flow path 9 of the flow path forming portion 1a to the end of the screw forming portion 1c.
  • One end of the needle insertion hole 16 is opened to the refrigerant flow path 9. The other end is connected to the end face of the screw forming portion 1c.
  • the needle 2 is slidably inserted into the dollar insertion hole 16.
  • a valve head 20 is formed at one end of the needle 2.
  • the needle 2 moves in the axial direction to increase or decrease the passage area between the valve head 20 and the valve seat 15.
  • the flow rate of the refrigerant flowing from the refrigerant inlet pipe 13 to the refrigerant outlet pipe 14 is controlled by this increase or decrease. Further, when the valve head 20 is seated on the valve seat portion 15, the refrigerant flow path 9 is completely closed, and the flow of the refrigerant is prevented.
  • the needle 2 is formed of a stepped shaft body having a large-diameter sliding shaft portion 2a located on the valve head 20 side and a small-diameter support shaft portion 2b.
  • the sliding shaft portion 2a is slidably supported by the valve body 1, and the axial position of the needle 2 is maintained.
  • a small needle fitting gap 17 is formed between the inner peripheral surface of the needle fitting insertion hole 16 and the sliding shaft 2 a of the needle 2.
  • an inner circumferential gap 22 having a larger gap size than the needle fitting gap 17 is formed between the inner circumferential surface of the 21 dollar fitting hole 16 and the support shaft portion 2b. ing.
  • the shoulder portion 1 b of the valve body 1 is provided with a predetermined hole that allows the needle fitting hole 16 passing through the axis of the shoulder portion 1 b to communicate with the lower end of the internal space 30 of the case 3.
  • a pressure equalizing hole 18 having a diameter is formed. That is, a pressure equalizing hole 18 having a predetermined diameter is formed so as to allow the above-mentioned 21 dollar fitting gap 17 to communicate with a first space portion 31 described later.
  • a male screw is formed on the outer peripheral surface of the screw forming portion 1c of the valve body 1.
  • a mouth 10 forming a part of the electric means X is arranged radially outside the screw forming portion 1c.
  • the electric means X drives the dollar 2 in the axial direction, and is constituted by a so-called stepping motor.
  • the electric means X includes the rotor part 10 described above and an electromagnet 5 arranged on the outer peripheral side of the case 3.
  • the mouth portion 10 includes a screw forming member 7 and a spacer 6.
  • the screw forming member 7 is formed in a bottomed cylindrical shape.
  • the spacer 6 is formed in a tubular shape having flanges at both ends.
  • a permanent magnet 4 is provided on the outer peripheral side of the.
  • a peripheral wall portion 7 a of the screw forming member 7 is forcibly fitted and fixed to the inner peripheral side of the spacer 6.
  • the mouth portion 10 is attached to the valve body 1 by inserting the screw forming member 7 into the screw forming portion 1c of the valve body 1 from above the screw forming portion 1c. . Accordingly, the row portion 10 rotates in accordance with the amount of power (pulse value) of the electromagnet 5, and the axial direction of the thread forming portion 1 c with respect to the thread forming portion 1 c of the valve body 1. Relative to.
  • the needle 2 is connected to the mouth 10 so that the dollar 2 opens and closes by the axial movement of the low end 10. That is, the upper end of the dollar 2 projects upward through the end face portion 7b of the screw forming member ⁇ ⁇ .
  • a fastening member 34 is provided at the protruding end of the dollar 2. The fastening member 34 prevents the needle 2 from dropping downward from the thread forming member 7.
  • a compression spring 35 is provided between the stepped portion between the sliding shaft portion 2 a and the support shaft portion 2 b of the needle 2 and the lower surface of the end surface portion b of the screw forming member 7. I have. The spring 35 constantly presses the needle 2 and the screw forming member 7 in the direction in which the fastening member 34 comes into contact with the end face 7 b of the screw forming member 7.
  • the two dollars 2 move integrally with the axial movement of the mouth 10 and flow path. Increase or decrease the area.
  • the downward movement of the needle 2 is restricted.
  • the row portion 10 further moves downward by a predetermined dimension while reducing the size of the spring 35.
  • the valve closing state of the needle 2 is maintained by the urging force of the panel 35.
  • a predetermined gap is formed between the fastening member 34 and the end face 7b of the screw forming member 7 (for example, see FIGS. 9 and 10 in the embodiment of the present invention).
  • the low-end portion 10 has a small distance between the permanent magnet 4 and the inner peripheral surface of the case 3 and is set to a small value. I have. This interval is, for example, about 0.2 mm. Accordingly, the internal space 30 of the case 3 is formed by the first opening 10 and the first space 3 located below the lower opening 10. 1 and a second space section 32 located above the row section 10. The first space 31 and the second space 32 communicate with each other via an outer circumferential gap 21 formed between the outer circumferential surface of the permanent magnet 4 and the inner circumferential surface of the case 3. .
  • the above electric expansion valve Z Is the electric expansion valve Z driven by the compressor.
  • the refrigerant pressure on the upstream side of the refrigerant increases, the refrigerant pressure increases.
  • the electric expansion valve Z There is a differential pressure inside the Then, a part of the refrigerant flows from the refrigerant flow path 9 into the internal space 30 of the case 3 through the twenty-one dollar fitting gap 17.
  • the other refrigerant rises through the needle insertion gap 17, and further from the needle insertion gap 17, the portion near the other end of the needle 2 and the needle insertion hole 1 of the valve body 1. It rises through the inner circumferential gap 22 formed between 6 and 6. Thereafter, the refrigerant is inverted, flows down through the joint gap 23 between the screw forming portion 1c of the valve body 1 and the screw forming member 7, and reaches the first space portion 31.
  • the refrigerant that has flowed into the first space 31 from these two paths and merged further rises through the outer circumferential gap 21 and flows into the second space 32.
  • the refrigerant flows into the first space 31 and the second space 32 of the case 3, and the differential pressure state on both sides in the axial direction of the mouth 10 is eliminated.
  • the smooth movement of the overnight section 10 is ensured.
  • the needle 2 moves integrally in conjunction with the movement of the row portion 10 to control the flow rate of the refrigerant.
  • the sliding part of the compressor used for the refrigeration system is made of metal under severe operating conditions. High temperature due to contact. As a result, the refrigerating machine oil and the processing oil remaining in the circuit are deteriorated, and sludge with high viscosity is generated. In addition, since the sludge has a property of being insoluble or hardly soluble in the refrigerant, sludge separated from the refrigerant is formed without being mixed with the refrigerant. This sludge circulates in the refrigeration circuit together with the refrigerant.
  • motorized expansion valve Z As described above, the refrigerant flows between the refrigerant flow path 9 and the internal space 30 of the case 3 with the start and stop of the operation of the compressor as described above. Moreover, the refrigerant flows through the narrow needle fitting gap 17, the joint gap 23, and the outer circumferential gap 21. For this reason, sludge easily adheres to these gaps 17, 23, 21.
  • the sludge adheres and accumulates in the $ 17 gap 17, the sludge has a high viscosity, which hinders the movement of the needle 2, that is, the control of the flow rate of the refrigerant. Further, if sludge adheres and accumulates in the joint gap 23 and the outer peripheral gap 21, the operation of the rotor section 10 is hindered. In any of these cases, abnormal liquid compression of the compressor or overheating of the compressor is caused, which is not preferable.
  • the present invention has been made in view of the above points, and an object of the present invention is to provide an electric needle valve for a refrigeration circuit and a refrigeration apparatus including the same, which can prevent the adhesion of sludge as much as possible. I do. Disclosure of the invention
  • the electric needle valve for a refrigeration circuit is provided with a needle insertion hole 16 through which the needle 2 is slidably inserted and provided facing one end of the needle insertion hole 16.
  • a valve body 1 having a refrigerant flow path 9 whose flow path area is adjusted by the needle 2, and the other end of the needle fitting hole 16 with respect to the valve body 1 is placed in its internal space 30. It is intended to include a case 3 which is attached in a state of being enclosed and has a case 3 in which at least a part of an electric means X for driving the above-mentioned dollar 2 is provided in the internal space 30. Then, the valve body 1 has the 21 dollar fitting hole 16 and the knee fitted therein.
  • a refrigerant flow reduction means P for reducing the flow rate of the refrigerant flowing from the refrigerant flow path 9 side to the internal space 30 side through the twenty-one dollar insertion gap 17 formed between the dollar 2 is provided. It is characterized by:
  • the refrigerant flow reducing means Y is connected to the refrigerant passage 9 and the internal space 30 by the needle fitting hole 16. It is characterized in that it is constituted by a refrigerant flow path 41 provided in the valve body 1 so as to communicate without passing through.
  • the large-diameter hole portion 16A in which the $ 21 fitting hole 16 is located near the refrigerant channel 9 is provided.
  • a pressure equalizing hole 18 communicating with the internal space 30 is formed, and the refrigerant flow rate reducing means P is constituted by the large-diameter hole 16A and the pressure equalizing hole 18.
  • the needle 2 is slidably supported in the large-diameter hole 16A and the large-diameter hole is formed.
  • a needle guide member 42 configured to allow the flow of the refrigerant in the axial direction of 16 A is provided. .
  • the twenty-first dollar fitting hole 16 is provided with a first small-diameter hole portion 16 C located near the refrigerant flow passage 9. And the second small-diameter hole portion 16E located near the electric means X, the first small-diameter hole portion 16C, and the first small-diameter hole portion 16C located between the first small-diameter hole portion 16C and the second small-diameter hole portion 16E.
  • a large-diameter hole portion 16D whose diameter is larger than that of the first small-diameter hole portion 16C, and the needle 2 is connected to the second small-diameter hole.
  • the refrigerant flow reducing means P is provided on the outer peripheral surface of the dollar 2 or in the hole 16 of the dollar fitting. It is characterized by comprising grooves 43 and 44 provided on the peripheral surface.
  • the valve body 1 in the electric needle valve for a refrigeration circuit according to the third or fourth aspect, includes a base 1A having the refrigerant flow path 9 and a base 1A.
  • the large diameter hole 16A is provided in the base 1A, and the small diameter hole 16B is provided in the sub part 1B. .
  • the valve body 1 is provided with a base 1A having the refrigerant flow passage 9 and a sub-unit separate from the base 1A.
  • the first small-diameter hole 16C and the large-diameter hole 16D correspond to the base 1A, and the second small-diameter hole 16E corresponds to the sub-portion 1B. It is characterized by having been provided.
  • a ninth invention is the electric needle valve for a refrigeration circuit according to the third, fourth, or fifth invention, wherein the pressure equalizing hole 18 is formed of a round hole and has an inner diameter of 1.2 mm or more. It is characterized by having done.
  • a tenth invention is characterized in that, in the electric refrigeration circuit dollar valve according to the ninth invention, a plurality of the pressure equalizing holes 18 are provided around the needle fitting hole 16. I have.
  • An eleventh invention is directed to an electric refrigerator valve for a refrigeration circuit according to the first, second, third, fourth, fifth, sixth, seventh, eighth, ninth or tenth invention. , Characterized in that the gap between the two dollar insertion gaps 17 is set to 0.2 mm or more.
  • the needle 2 is provided so as to face the one end side of the needle insertion hole 16 through which the needle 2 is slidably disposed.
  • a thirteenth aspect of the present invention is the electric refrigerator for a refrigeration circuit according to the first aspect of the present invention, wherein the refrigerant flow reducing means Q is opposed to the other end of the needle fitting hole 16 by the electric motor.
  • the method is characterized by comprising a communication hole 45 provided on the X side.
  • a fourteenth invention is directed to the electric needle valve for a refrigeration circuit according to the first invention, wherein the refrigerant flow reducing means Q is connected to the end of the needle 2 inserted into the needle fitting hole 16.
  • a coolant flow path 49 provided on the side of the section for allowing the needle fitting hole 16 to communicate with the internal space 30 when the needle 2 is relatively displaced in the axial direction with respect to the electric means X. , 50.
  • the needle 2 is slidably inserted through the needle insertion hole 16 and the needle insertion hole 16.
  • a valve body 1 having a refrigerant flow path 9 whose flow path area is adjusted by the dollar 2, and the other end of the needle fitting hole 16 with respect to the valve body 1 is formed in an internal space 3.
  • a case 3 in which at least a part of the electric means X for driving the needle 2 is provided in the internal space 30 and an outer periphery of the electric means X.
  • an outer peripheral gap 21 is formed between the inner surface of the case 3 and the inner peripheral surface of the case 3 is intended.
  • the refrigerant flow reducing means R is provided by changing a peripheral wall portion of the permanent magnet 4 provided in the electric means X in the axial direction. This is characterized in that it is constituted by a refrigerant flow path 46 formed so as to penetrate through.
  • a seventeenth invention is directed to an electric needle valve for a refrigeration circuit according to the fifteenth invention,
  • the refrigerant flow reducing means R is provided on the inner peripheral side of the permanent magnet 4 provided in the electric means X, and passes through the peripheral wall portion of the spacer 6 which holds the permanent magnet 4 in the axial direction thereof. It is characterized by comprising road 47.
  • An eighteenth invention is directed to the electric refrigerator valve for a refrigeration circuit according to the fifteenth invention, wherein the refrigerant flow reduction means R is provided by: a permanent magnet 4 provided in the electric means X; It is characterized in that it is constituted by a refrigerant flow path 48 formed on the inner peripheral side and formed at an abutting portion with a spacer 6 holding the same.
  • a nineteenth invention is characterized in that the electric needle valve for a refrigeration circuit according to any one of the first invention to the eighteenth invention is applied as an expansion valve.
  • a 20th invention is characterized in that, in the refrigeration apparatus according to the 19th invention, an HFC refrigerant having a theoretical discharge temperature higher than R22 or a mixed refrigerant containing an HFC refrigerant is used as the refrigerant. .
  • an HFC refrigerant having a theoretical discharge temperature higher than R12 and R502 or a mixed refrigerant containing an HFC refrigerant is used as the refrigerant. It is characterized by:
  • a twenty-second invention is characterized in that, in the refrigerating apparatus according to the nineteenth invention, only R32 or a mixed refrigerant containing R32 is used as the refrigerant.
  • a twenty-third invention is characterized in that, in the refrigerating apparatus according to the nineteenth invention, a synthetic oil is used as a refrigerating machine oil.
  • a twenty-fourth invention is characterized in that, in the refrigerating apparatus according to the twenty-second invention, a polyol ester, a carbonate ester, a polyvinyl ether, an alkyne benzene or a polyalkylene glycol is used as a base oil of the synthetic oil.
  • a twenty-fifth invention is characterized in that, in the refrigerating apparatus according to the twenty-first or twenty-first invention, a synthetic oil containing an extreme pressure additive is used as a refrigerating machine oil.
  • a twenty-sixth invention is directed to the refrigeration apparatus according to the nineteenth, twenty-ninth, twenty-first, twenty-second, twenty-third, twenty-fourth, or twenty-fifth refrigerating apparatuses, wherein the use-side heat exchanger or the heat source-side heat exchanger It is characterized by having multiple exchangers. Effect of one invention
  • the present invention has the following effects.
  • An electric needle valve for a refrigeration circuit provides a valve body (1) including a dollar insertion hole (16) and a refrigerant flow path (9) having one end opening of the needle insertion hole (16). ), A case (3) attached to the valve body (1), and a dollar (21) inserted into the needle fitting hole (16) and adjusting the flow passage area of the refrigerant flow passage (9). 2) and electric means (X) for driving the needle (2). Further, while the valve body (1) at the other end of the dollar insertion hole (16) is located in the internal space (30) of the case (3), at least a part of the electric means (X) is provided. Is stored in the internal space (30) of the case (3).
  • valve body (1) is provided with a refrigerant flow passage through a dollar insertion gap (17) formed between the needle insertion hole (16) and the needle (2).
  • Refrigerant flow rate reducing means (P) for reducing the flow rate of the refrigerant flowing into the internal space (30) from the path (9) is provided.
  • the refrigerant in the twenty-first fitting gap 17 is reduced by the coolant flow reduction means P.
  • the flow rate is reduced.
  • the amount of the sludge admixed with the refrigerant on the wall surface of the 21 dollar insertion gap 17 is reduced by the reduced amount, and the malfunction of the needle 2 caused by the attachment of the sludge is prevented as much as possible. Is done.
  • by ensuring the proper operation of the needle 2 abnormal liquid compression or overheating in the compressor of the refrigeration circuit is prevented beforehand, and reliability is improved.
  • the refrigerant flow reducing means P communicates the refrigerant flow path (9) and the internal space (30) separately with the needle fitting hole (16). It is constituted by a refrigerant flow path (41) provided in the valve main body (1) so as to make it work.
  • An electric needle valve for a refrigeration circuit according to a third invention is the electric needle valve for a refrigeration circuit according to the first invention, wherein the needle fitting hole (16) is located closer to the refrigerant flow path (9).
  • the refrigerant flow rate reducing means (P) is arranged so that the large-diameter hole (16A) and the internal space (30) communicate with the small-diameter hole (16B) separately. )) And the large-diameter hole (16A).
  • the needle fitting gap 17 formed between the inner peripheral surface of the needle fitting hole 16 and the outer peripheral surface of the needle 2 is formed.
  • the portion corresponding to the large hole portion 16A located closer to the refrigerant flow passage 9 has a larger passage area and a smaller passage resistance than the portion corresponding to the small diameter hole portion 16B.
  • the pressure equalizing hole 18 is formed in the large-diameter hole portion 16A.
  • the refrigerant from the refrigerant flow path 9 mainly flows from the portion corresponding to the large-diameter hole portion 16A to the internal space 30 via the equalizing hole 18, and the small-diameter hole portion 16B ,
  • the flow rate of the refrigerant flowing through is relatively reduced.
  • the portion of the needle fitting gap 17 corresponding to the small-diameter hole 16B is a narrow gap, adhesion of sludge to this portion is suppressed as much as possible. That is, the effect of the first invention can be surely achieved by a simple and inexpensive configuration in which the large-diameter hole portion 16A and the equalizing hole 18 are formed.
  • An electric needle valve for a refrigeration circuit according to a fourth invention is the electric needle valve for a refrigeration circuit according to the third invention, wherein the large-diameter hole portion (16A) movably supports the needle (2).
  • a guide member (42) for allowing the refrigerant to flow in the axial direction of the large-diameter hole (16A) is provided.
  • the axis of the dollar 2 can be more reliably held by the needle guide member 42 while ensuring the circulation of the refrigerant in the dollar insertion gap 17. You. As a result, the effect of the third invention is further promoted.
  • An electric needle valve for a refrigeration circuit according to a fifth invention is the electric needle valve for a refrigeration circuit according to the first invention, wherein the needle fitting hole (16) is provided in the refrigerant flow path (9).
  • a first small-diameter hole (16C) positioned closer to the motor, a second small-diameter hole (16E) positioned closer to the electric means (X), the first small-diameter hole (16C) and a second small-diameter hole ( 16E) and a large diameter hole (16D) having a larger diameter than the first small diameter hole (16C) and an axial length longer than the first small diameter hole (16C).
  • the needle fitting insertion hole (16) supports the needle (2) movably by the second small diameter hole (16E), or the first small diameter hole (16C) and the second small diameter hole. It is configured to be movably supported by both parts (16E).
  • the refrigerant flow rate reducing means (P) is configured to connect the large-diameter hole (16D) and the internal space (30) to the second small-diameter hole (16E) separately. It is composed of a pressure equalizing hole (18) provided in the main body (1) and the large-diameter hole (16D).
  • the needle fitting gap formed between the inner peripheral surface of the needle fitting hole 16 and the outer peripheral surface of the needle 2 is formed.
  • the portion corresponding to the large-diameter hole portion 16A located closer to the refrigerant flow path 9 has a passage area larger than the portions corresponding to the first and second small-diameter hole portions 16C and 16E.
  • the passage resistance is greatly reduced. Since the pressure equalizing holes 18 are formed in portions corresponding to the large-diameter holes 16A, the refrigerant flow passage 9 passes through the first small-diameter holes 16C to the large-diameter holes 16D.
  • the flowing refrigerant mainly flows from the large-diameter hole portion 16D to the internal space 30 via the equalizing hole 18.
  • the flow rate of the refrigerant flowing through the second small-diameter hole portion 16E is relatively reduced, and the attachment of sludge to the second small-diameter hole portion 16E is suppressed as much as possible.
  • the refrigerant flows through the first small-diameter hole portion 16C the amount of sludge adhering to this portion is kept small because the length is shorter than that of the large-diameter hole portion 16D. Is done.
  • the inhibition of the operation of the needle 2 by the attached sludge is prevented as much as possible, and the proper operation of the needle 2 is ensured. Therefore, the first invention Is reliably achieved.
  • An electric needle valve for a refrigeration circuit according to a sixth invention is the electric needle valve for a refrigeration circuit according to the first invention, wherein the refrigerant flow reduction means (P) is provided on the outer peripheral surface of the twenty-first dollar (2) or It consists of grooves (43, 44) provided on the inner peripheral surface of the needle insertion hole (16).
  • the refrigerant flow reduction means (P) is provided on the outer peripheral surface of the twenty-first dollar (2) or It consists of grooves (43, 44) provided on the inner peripheral surface of the needle insertion hole (16).
  • the refrigerant flows through the needle insertion gap 17 formed between the outer peripheral surface of the needle 2 and the inner peripheral surface of the needle insertion hole 16, the refrigerant flows through the grooves 43 and 44 having a small passage resistance.
  • the flow mainly flows, and the flow rate of the refrigerant in a narrow portion other than the grooves 43 and 44 is relatively reduced, whereby the adhesion of sludge to the wall surface of the needle insertion gap 17 is suppressed accordingly. That is, the effect of the first invention can be surely achieved by the simple and inexpensive configuration of the formation of the grooves 43 and 44.
  • An electric needle valve for a refrigeration circuit according to a seventh invention is the electric needle valve for a refrigeration circuit according to the third or fourth invention, wherein the valve body (1) includes the refrigerant flow path (9).
  • the large-diameter hole (16A) is provided in the base (1A), and the small-diameter hole (16A) is formed of a base (1A) and a sub-portion (1B) separate from the base (1A). 16B) is provided in the subsection (1B).
  • An electric needle valve for a refrigeration circuit according to an eighth invention is the electric needle valve for a refrigeration circuit according to the fifth invention, wherein the valve body (1) has a base (1A) provided with the refrigerant flow path (9). ) And the sub-portion (1B) separate from the base portion (1A), the first small-diameter hole portion (16C) and the large-diameter hole portion (16D) are provided in the base portion (1A), The second small diameter hole (16E) is provided in the sub-portion (1B).
  • the fourth invention or the fifth invention for example, the valve Processing of the above-mentioned holes is easier than in the case where the main body 1 is formed as an integral structure. That can be expected to reduce the manufacturing cost of the electric 21 dollar valve.
  • An electric needle valve for a refrigeration circuit according to a ninth invention is the electric needle valve for a refrigeration circuit according to the third, fourth, or fifth invention, wherein the pressure equalizing hole (18) is a circular hole. Sa
  • the pressure equalizing hole 18 is 1.2 mm or more, the pressure equalizing hole 18 is almost certainly prevented from clogging due to sludge adhesion. The pressure equalizing action is maintained well.
  • An electric needle valve for a refrigeration circuit according to a tenth aspect of the present invention is the electric needle valve for a refrigeration circuit according to the ninth aspect, wherein the pressure equalizing hole (18) is provided with the 21 dollar insertion hole (1).
  • the electric needle valve for a refrigeration circuit according to the eleventh invention is characterized in that the first, second, third, and
  • the gap between the needle fitting gaps (17) is set to 0.2 mm or more. While maintaining the axial center holding action of the needle 2, the needle fitting gap 1
  • An electric needle valve for a refrigeration circuit is a valve provided with a needle fitting hole (16) and a refrigerant flow path (9) having one end of the needle fitting hole (16) opened.
  • a needle (2) and electric means (X) for driving the needle (2) are provided.
  • the valve body (1) at the other end of (16) is located in the inner space (30) of the case (3), and at least a part of the electric means (X) is located in the inner space (30) of the case (3).
  • the electric means (X) includes a threaded portion that fits into the valve body (1) outside the needle fitting hole (16) and extends in the axial direction of the needle fitting hole (16).
  • a mating gap (23) between the screw portion of the electric means (X) and the valve body (1) communicates with the other end of the needle fitting hole (16).
  • a coolant flow rate reducing means (Q) for reducing the flow rate of the coolant flowing from the coolant flow path (9) into the joint gap (23) through the needle fitting hole (16).
  • the flow rate of the refrigerant flowing into the combined gap 23 is reduced by the coolant flow reduction means Q. Due to the decrease, the amount of sludge admixed to the coolant on the wall surface of the joint gap 23 is reduced, and malfunction of the screw portion caused by the adhesion of the sludge is prevented as much as possible. . Furthermore, by ensuring the proper operation of the electric means X, abnormal liquid compression or overheating in the compressor of the refrigeration circuit is prevented beforehand, and reliability is improved.
  • the refrigeration circuit electric dollar valve according to a thirteenth aspect of the present invention is the refrigeration circuit electric dollar valve according to the twenty-first aspect, wherein the refrigerant flow rate reducing means (Q) is fitted with the twenty-first dollar. It is constituted by a communication hole (45) provided in the electric means (X) opposite to the other end of the hole (16). Therefore, the refrigerant flowing into the other end side of the needle fitting hole 16 through the needle fitting gap 17 between the needle fitting hole 16 and the needle 2 is more passage than the combined gap 23. It flows mainly through the communication hole 45 with little resistance. As a result, in the joint gap 23. The flow rate of the refrigerant is relatively reduced, and the sludge is prevented from adhering to the wall surface of the joint gap 23 accordingly. That is, according to the present invention, the effects of the first and second inventions can be reliably obtained by a simple and inexpensive structure in which the communication holes 45 are formed.
  • An electric needle valve for a refrigeration circuit according to a fourteenth aspect of the present invention is the electric needle valve for a refrigeration circuit according to the twenty-second aspect, wherein the refrigerant flow reduction means (Q) is provided at an end of the needle (2).
  • the needle insertion hole 16 and the needle 2 are connected to each other.
  • the flow rate of the refrigerant relatively decreases, and accordingly, the adhesion of sludge to the wall surface of the joint gap 23 is suppressed. That is, in the present invention, the first and second refrigerant flow paths 49 and 50 are formed by a simple and inexpensive structure. The effect of the second invention is reliably obtained.
  • An electric needle valve for a refrigeration circuit provides a valve body (21) including a dollar insertion hole (16) and a refrigerant flow path (9) having one end of the needle insertion hole (16) opened. 1), a case (3) attached to the valve body (1), and a needle (2) inserted into the needle fitting hole (16) and adjusting the flow passage area of the refrigerant flow passage (9). And electric means (X) for driving the needle (2). Further, the valve body (1) on the other end of the dollar insertion hole (16) is located in the internal space (30) of the case (3), and at least a part of the electric means (X) is It is stored in the internal space (30) of the case (3).
  • an outer circumferential gap (21) is formed between the outer circumferential surface of the electric means (X) and the inner circumferential surface of the case (3).
  • the first space portion (31) located on one side of the electric means (X) and the second space portion (31) located on the other side of the electric space (30) in the internal space (30) via the outer circumferential gap (21). 32) is provided with means (R) for reducing the flow rate of the refrigerant flowing between them.
  • the refrigerant flow rate decreases.
  • R the flow rate of the refrigerant flowing through the outer circumferential gap 21 is reduced.
  • the amount of the sludge mixed in the refrigerant on the wall surface of the outer circumferential gap 21 is reduced by the reduced amount, and the malfunction of the electric means X caused by the sludge is prevented as much as possible.
  • the electric means X by ensuring proper operation of the electric means X, abnormal liquid compression or overheating in the compressor of the refrigeration circuit is prevented, and the reliability thereof is improved.
  • An electric needle valve for a refrigeration circuit according to a sixteenth invention is the electric needle valve for a refrigeration circuit according to the fifteenth invention, wherein the refrigerant flow reduction means (R) is replaced by a permanent magnet of the electric means (X).
  • the refrigerant flowing between the first space portion 31 and the second space portion 32 mainly flows through the refrigerant flow passage 46 having a lower passage resistance than the outer circumferential space 21.
  • the flow rate of the refrigerant relatively decreases, and accordingly, the adhesion of sludge to the wall surface of the outer peripheral gap 21 is suppressed. That is, in the present invention, the refrigerant flow path 46 is formed.
  • An electric needle valve for a refrigeration circuit according to a seventeenth aspect of the present invention is the electric needle valve for a refrigeration circuit according to the fifteenth aspect, wherein the refrigerant flow rate reducing means (R) is replaced by the electric means (X). It is constituted by a refrigerant flow path (47) formed in the peripheral wall portion of the spacer (6) which is located on the inner peripheral side of the permanent magnet (4) and holds the permanent magnet (4).
  • the refrigerant flowing between the first space 31 and the second space 32 mainly flows through the refrigerant flow path 47 having a lower passage resistance than the outer circumferential gap 21.
  • the flow rate of the refrigerant on the outer peripheral gap 21 side is relatively reduced, and accordingly, the adhesion of sludge to the wall surface of the outer peripheral gap 21 is suppressed. That is, in the present invention, the effect of the fifteenth aspect can be reliably obtained by a simple and inexpensive structure in which the refrigerant flow path 47 is formed.
  • An electric needle valve for a refrigeration circuit according to an eighteenth aspect of the present invention is the electric needle valve for a refrigeration circuit according to the fifteenth aspect, wherein the refrigerant flow rate reducing means (R) is replaced by the electric motor (X).
  • the refrigeration apparatus according to the nineteenth aspect of the present invention is the refrigeration apparatus according to any one of the first to sixth aspects of the present invention, and the twelfth aspect to the eighteenth aspect of the invention. It is applied as
  • the refrigeration apparatus according to a 20th aspect of the present invention is the refrigeration apparatus according to the 19th aspect, wherein the refrigerant uses an HFC refrigerant having a theoretical discharge temperature higher than R22 or a mixed refrigerant containing an HFC refrigerant. .
  • the amount of sludge generated in the compressor increases as the refrigerant discharge temperature increases. Therefore, if an HFC refrigerant or a mixed refrigerant containing an HFC refrigerant having a theoretical discharge temperature higher than R22 is used as the refrigerant, the sludge generation amount itself increases. As a result, malfunctions due to sludge adhesion to the electric expansion valve are likely to occur.
  • the refrigeration apparatus of the present invention provides the electric expansion valve according to any one of the first to sixth inventions and the twelfth to eighteenth inventions. Since the electric needle valve is used, proper operation of the electric expansion valve is ensured and proper operation of the refrigeration system is realized despite the large amount of sludge generated due to the characteristics of the refrigerant.
  • the refrigeration apparatus according to the twenty-first aspect is the refrigeration apparatus according to the nineteenth aspect, wherein the refrigerant includes an HFC refrigerant or a HFC refrigerant having a theoretical discharge temperature higher than R12 and R502 as the refrigerant. Refrigerant is used.
  • the amount of sludge generated in the compressor increases as the refrigerant discharge temperature increases. Therefore, when an HFC refrigerant or a mixed refrigerant containing an HFC refrigerant whose theoretical discharge temperature is higher than R12 and R502 is used as the refrigerant, the sludge generation amount itself increases. As a result, operation failure due to sludge adhesion to the electric expansion valve is likely to occur.
  • the refrigeration apparatus of the present invention provides the electric expansion valve according to any one of the first to sixth inventions and the twelfth to eighteenth inventions. Since the electric needle valve is used, proper operation of the electric expansion valve is ensured and proper operation of the refrigeration system is realized despite the large amount of sludge generated due to the characteristics of the refrigerant.
  • the refrigeration apparatus according to the twenty-second invention is the refrigeration apparatus according to the nineteenth invention.
  • the refrigerant a single refrigerant of R32 or a mixed refrigerant containing R32 is used.
  • R32 has advantages such as a low global warming potential, high theoretical COP and high heat transfer efficiency, and high energy efficiency when used in a refrigeration system due to low refrigerant pressure loss. is there.
  • the discharge temperature is higher and the amount of generated sludge is larger than that of R22 or the like.
  • the refrigeration apparatus of the present invention provides the above-described first to sixth inventions and the 12th invention as the electric expansion valve even if only R32 or a mixed refrigerant containing R32 is used as the refrigerant. Since the electric needle valve for a refrigeration circuit according to any one of the inventions to the eighteenth invention is applied, proper operation of the electric expansion valve is ensured despite the large amount of sludge generated. It is possible to provide a refrigerating device having a high effect of preventing global warming.
  • a refrigeration apparatus is the refrigeration apparatus according to the nineteenth invention, wherein a synthetic oil is used as a refrigeration oil, and a refrigeration apparatus according to the twenty-fourth invention is a base oil of the synthetic oil.
  • a synthetic oil is used as a refrigeration oil
  • a refrigeration apparatus according to the twenty-fourth invention is a base oil of the synthetic oil.
  • Polyol ester, carbonate ester, polyvinyl ether, alkyne benzene or polyalkylene glycol is used.
  • the synthetic oil is composed of molecules having a narrow range of molecular weight and a nearly unitary structure, unlike mineral oil used as refrigeration oil in a refrigeration system using R22 as a refrigerant, for example. I have. For this reason, the synthetic oil is easily damaged when it undergoes a chemical change under the influence of moisture, air or impurities. This chemical damage also increases sludge generation. Therefore, in a refrigeration apparatus using such synthetic oil as refrigeration oil, malfunction of the electric expansion valve is likely to occur due to sludge adhesion.
  • the refrigeration apparatus of the present invention provides the above-described first to sixth and 12th to 18th inventions as the electric expansion valve even when the synthetic oil such as the above-mentioned polyol ester is used as the refrigeration oil. Since the electric $ 21 valve for the refrigeration circuit of any one of the inventions is applied, proper operation of the electric expansion valve is ensured despite the large amount of sludge generated due to the properties of the refrigeration oil, It is possible to provide a refrigeration apparatus with high operational reliability.
  • a refrigeration apparatus is the refrigeration apparatus according to the twenty-first or twenty-first aspect, wherein a synthetic oil containing an extreme pressure additive is used as the refrigerating machine oil.
  • the HFC refrigerant generally has poor self-lubricating properties as compared with the HCFC refrigerant, so it is necessary to add an extreme pressure additive to the refrigerating machine oil.
  • this extreme pressure additive reacts with iron on the high-temperature metal sliding surface to form sludge. Therefore, when the HFC refrigerant is used and the synthetic oil to which the extreme pressure additive is added as the refrigeration oil is used, malfunction of the electric expansion valve due to sludge adhesion is likely to occur.
  • the above-described first to sixth and 12th inventions can be used as the electric expansion valve. Since any one of the eighteenth inventions employs the electric dollar valve for the refrigeration circuit, proper operation of the electric expansion valve is ensured despite the large amount of sludge being generated. Refrigeration equipment with high reliability can be provided.
  • the refrigeration apparatus according to the twenty-sixth invention is the refrigeration apparatus according to the nineteenth, twenty-ninth, twenty-first, twenty-second, twenty-third, twenty-fourth, or twenty-fifth, wherein Or it has multiple heat source side heat exchangers.
  • the refrigerant piping length is shorter than that of a refrigeration apparatus in which a use side heat exchanger and a heat source side heat exchanger are connected one-to-one. Becomes longer. Then, the amount of moisture, air or impurities in the pipes is also large, and the probability of mixing with the refrigeration circuit to generate sludge increases. Therefore, in a refrigeration system having a plurality of use-side heat exchangers or heat-source-side heat exchangers, malfunction of the electric expansion valve due to sludge adhesion tends to be a problem.
  • FIG. 1 shows a motor-operated dollar valve for a refrigeration circuit according to a first embodiment of the present invention. It is principal part sectional drawing which shows the structure of an electric expansion valve.
  • FIG. 2 is a cross-sectional view of a main part showing the structure of an electric expansion valve as a second embodiment of the electric refrigerator valve for a refrigeration circuit according to the present invention.
  • FIG. 3 is a sectional view of a main part showing a structure of an electric expansion valve as a third embodiment of the electric refrigeration circuit dollar valve for a refrigeration circuit according to the present invention.
  • FIG. 4 is an enlarged cross-sectional view taken along the line IV-IV of FIG.
  • FIG. 5 is a sectional view of a main part showing a structure of an electric expansion valve as a fourth embodiment of the electric needle valve for a refrigeration circuit according to the present invention.
  • FIG. 6 is a sectional view of a main part showing a structure of an electric expansion valve as a fifth embodiment of the electric needle valve for a refrigeration circuit according to the present invention.
  • FIG. 7 is a cross-sectional view of a main part showing a structure of an electric expansion valve as a sixth embodiment of the electric needle valve for a refrigeration circuit according to the present invention.
  • FIG. 8 is a cross-sectional view of a main part showing the structure of an electric expansion valve as a seventh embodiment of the electric refrigerator valve for a refrigeration circuit according to the present invention.
  • FIG. 9 is a cross-sectional view of a main part showing the structure of an electric expansion valve as an eighth embodiment of the electric refrigeration circuit valve for a refrigeration circuit according to the present invention.
  • FIG. 10 is a cross-sectional view of a main part showing the structure of an electric expansion valve as a ninth embodiment of the electric needle valve for a refrigeration circuit according to the present invention.
  • FIG. 11 is a sectional view of a main part showing the structure of an electric expansion valve as a tenth embodiment of the electric needle valve for a refrigeration circuit according to the present invention.
  • FIG. 12 is a cross-sectional view of a main part showing the structure of an electric expansion valve as a first embodiment of an electric motor-operated dollar valve for a refrigeration circuit according to the present invention.
  • FIG. 13 is a cross-sectional view of a principal part showing a structure of an electric expansion valve as a 12th embodiment of the electric refrigeration circuit dollar valve according to the present invention.
  • FIG. 14 is a cross-sectional view of a main part showing a structure of a conventional general electric expansion valve for a refrigeration circuit.
  • the electric expansion valves Z 1 to Z 12 of the respective embodiments described below have the same basic structure as the conventional electric expansion valve Z fl shown in FIG. 14 described above.
  • the member corresponding to the constituent members of the electric expansion valve ZQ shown in FIG. 1 was subjected to 1 4
  • the same reference numeral as the reference numeral is assigned.
  • the electric expansion valve of FIG. The description of the members corresponding to the above will be omitted, and only the components specific to each embodiment will be described in detail.
  • FIG. 1 shows an electric expansion valve Zi according to the first embodiment.
  • reference numeral 1 is a valve body
  • 2 is a needle
  • 3 is a case
  • 4 is a permanent magnet
  • 5 is an electromagnet
  • 6 is a spacer
  • 7 is a screw forming member
  • 10 is the permanent magnet 4 and a spacer.
  • This is a mouth portion formed by a coil 6 and a screw forming member 7
  • the electric means X is constituted by the b portion 10 and the electromagnet 5.
  • the electric expansion valve Z! Allows sludge to adhere to the wall of the narrow needle insertion gap 17 formed between the needle insertion hole 16 provided in the valve body 1 and the needle 21 fitted in the needle insertion hole 16. Its primary purpose is to prevent it as far as possible.
  • the motor-operated expansion valve according to this embodiment responds to an increase or decrease in the refrigerant pressure on the refrigerant flow path 9 side due to the operation and stoppage of the compressor (not shown). When the refrigerant flows between the internal space 30 on the case 3 side, by reducing the amount of refrigerant flowing through the needle insertion gap 17, sludge can be attached to the wall surface of the needle insertion gap 17. As much as possible.
  • the flow passage forming portion 1a of the valve body 1 is provided with:
  • the refrigerant flows from the refrigerant flow path 9 to the internal space 30 when the compressor starts operating, and flows from the internal space 30 to the refrigerant flow path 9 when the compressor stops operating.
  • the passage resistance between the needle insertion gap 17 and each of the refrigerant flow paths 41, 41,... Is such that the side of the refrigerant flow path 41, 41,. Fitting gap 17 Much smaller than the 7 side. Therefore, most of the refrigerant flows through the refrigerant channels 41, 41,..., And the amount of the refrigerant flowing through the needle fitting gap 17 is relatively reduced by that much.
  • FIG. 2 shows an electric expansion valve Z2 according to a second embodiment of the present invention.
  • Electrically operated expansion valve Z 2 This is a first aspect of the present invention, the third invention, the seventh invention, in which the invention and the invention of the first 0 of the ninth is applied.
  • This electric expansion valve Z 2 is similar to the electric expansion valve Z 1 according to the first embodiment, and forms sludge on the wall surface of the needle fitting gap 17. The structure is intended to prevent the operation failure of the needle 2 due to the adhesion.
  • the electric expansion valve Z 2 of this embodiment is characterized by the following structure.
  • valve body 1 The structure of the valve body 1 is as follows.
  • the valve body 1 has a structure in which the flow path forming portion 1a, the shoulder portion 1b, and the screw forming portion 1c are integrally provided.
  • the valve body 1 of this embodiment includes a base 1A having only the flow path forming section 1a and the shoulder 1b, and a screw forming member 8 corresponding to the screw forming section 1c. And a substructure 1B.
  • the needle fitting hole 16 is composed of a large-diameter hole 16A located on the base 1A side and a small-diameter hole 16B located on the sub-portion 1B side.
  • the small-diameter hole portion 16B is set to have a diameter approximate to the outer diameter of the needle 2 so that the small-diameter hole portion 16B can slidably support the dollar 2, and a gap with the outer peripheral surface of the needle 2 is provided.
  • the large-diameter hole 16 A is set to have a larger diameter than the small-diameter hole 16 B, and the gap between the outer peripheral surface of the dollar 21 and the needle fitting gap 17 is larger than that of the needle fitting gap 17.
  • An annular gap 24 with a large gap size is used.
  • the base 1A is provided with a plurality of pressure equalizing holes 18 that communicate the annular gap 24 and the first space 31.
  • the needle insertion gap 17 on the sub-portion 1B side and the annular shape on the base portion 1A side The passage resistance between the gap 24 and the annular gap 24 is much smaller than that of the needle fitting gap 17.
  • the pressure equalizing holes 18 are formed facing the annular gap 24, for example, when the refrigerant flows from the refrigerant flow path 9 to the internal space 30, the refrigerant flow path 9 The refrigerant flowing into the annular gap 24 from above It flows from the space 24 directly to the first space 31 via the pressure equalizing hole 18. Therefore, the amount of refrigerant in the needle fitting gap 17 having a large passage resistance relatively decreases.
  • the needle 2 is supported by the small-diameter hole 16B on the screw forming member 8 side, which constitutes the sub-portion 1B, of the needle fitting insertion hole 16.
  • the shaft center of the needle 2 is reliably held, and the control of the refrigerant flow rate by the needle 2 is performed with high reliability.
  • the valve body 1, the base portion 1 A and the base portion 1 A with the refrigerant passage 9 constituted by a secondary portion 1 B of the separate I have.
  • each hole can be expected that much manufacturing cost Bok cost reduction of the electric expansion valve Z 2.
  • the pressure equalizing hole 18 is formed of a round hole and the inner diameter thereof is set to 1.2 mm or more, the pressure equalizing hole 18 is almost certainly prevented from being clogged by sludge adhesion. Thus, the pressure equalizing action of the pressure equalizing holes 18 is favorably maintained. As a result, an electric expansion valve
  • FIG. 3 shows an electric expansion valve Z3 according to a third embodiment of the present invention.
  • the electric expansion valve Z 3 is the second embodiment in that such electric expansion valve Z 2 was further developed embodiment, in addition to the same structure as the electric expansion valve Z 2, the annular clearance 2 4 parts
  • the next needle guide member 42 is attached to the second member.
  • the needle guide member 42 has a needle fitting hole 42 a having an inner diameter capable of slidably supporting the needle 2 on the inner circumference thereof, while the needle fitting hole 42 a Are provided with a plurality of refrigerant channels 42b, 42b,.
  • the electric expansion valve Z 3 having a, in addition to the same effects as the electric expansion valve Z 2 according to the above Symbol second embodiment can be obtained, the following An effect can be obtained.
  • the electric expansion valve Z 3, said needle guide member 4 2 by setting only, said needle guide member 4 2 and the thread forming member 8 side of the small-diameter hole portion 1 6 B both are thus sliding the needle 2 It is movably supported.
  • the holding of the center axis of ⁇ Ni one US dollar 2 becomes more reliable, more enhanced reliability of the operation of the electric expansion valve Z 3.
  • refrigerant flow reduction means P between the annular clearance 2 4 and equalizing hole 1 8 is formed.
  • FIG. 5 shows an electric expansion valve Z4 according to a fourth embodiment of the present invention.
  • Electrically operated expansion valve Z 4 This is a first aspect of the present invention, the fifth invention, the eighth invention, leaving what invention and the invention of the first 0 of the ninth is applied.
  • the electric expansion valve Z 4 is a modification of the electric expansion valve Z 3 according to the third embodiment.
  • the electric expansion valve Z3 according to the third embodiment includes the needle guide member 42, thereby supporting the lower side of the needle 2.
  • the electric expansion valve Z 4 in this embodiment the support of the lower side of the needle 2 to perform in the base portion 1 A side, it was unnecessary by connexion the needle guide member 4 2 of the attached thereto Things.
  • the needle of the needle fitting ⁇ 1 6 formed from the base portion 1 A with One extend over the secondary portion 1 B, located in the refrigerant passage 9 nearer
  • the first small-diameter hole portion 16 C having a diameter slightly larger than the outer diameter of the first and second small-diameter hole portions 16 C, and being continuous with the first small-diameter hole portion 16 C having a diameter larger than the first small-diameter hole portion 16 C.
  • a large-diameter hole 16 D having one end of the equalizing hole 18 opened therein, and the first small-diameter hole 16 C provided on the screw forming member 8 constituting the sub-portion 1 B.
  • the axial length of the first small-diameter hole 16C is set to be shorter than that of the large-diameter hole 16D.
  • the needle 2 is supported by both the first small diameter hole 16C and the second small diameter hole 16B.
  • the third embodiment of without the electric expansion valve the twenty-one Dorugai de member 4 2 such as Z 3 is provided in the embodiment of the third electric expansion valve Z 3 and similar of Operational effects are obtained.
  • the manufacturing cost can be expected to be reduced because the needle guide member 42 is unnecessary.
  • the annular clearance 2 4 ⁇ between 2 5 fitted twenty-one U.S. dollars, which is formed on the first small-diameter hole portion 1 6 C corresponding to the large-diameter hole portion 1 6 D
  • the passage area is larger than the 21st insertion gap 17 corresponding to the second small diameter hole 16E, and the passage resistance is smaller.
  • the large-diameter holes 16D pass through the first small-diameter holes 16C from the refrigerant flow path 9.
  • the refrigerant mainly flowing from the large-diameter hole 16 D having a small passage resistance flows into the internal space 30 through the equalizing hole 18. For this reason, the flow rate of the refrigerant flowing through the 21st clearance gap 17 relatively decreases.
  • the coolant flow reduction means P between the annular clearance 2 4 and the pressure equalizing hole 1 8 is formed.
  • Fifth Embodiment and Sixth Embodiment-FIG. 6 shows an electric expansion valve Z5 according to a fifth embodiment of the present invention
  • FIG. 7 shows an electric expansion valve Z5 according to a sixth embodiment of the present invention.
  • Each of the motorized expansion valves Z 6 is shown.
  • These electric expansion valve Z 5, Z 6 each embodiment is the also the first invention and the sixth invention of the present application is applied.
  • the electric expansion valve Z 5, Z 6, as the electric expansion valve Z! To Z 4 in the above embodiments, aims to prevent the adhesion of sludge in the needle fitting ⁇ between 1 7 parts However, a specific structure for realizing this is different from the above-described electric expansion valves Z 1 to Z 2.
  • the electric expansion valves Z 5 and Z 6 according to the fifth and sixth embodiments are the same as the conventional electric expansion valve Z shown in FIG. Based on the structure.
  • the electric expansion valve Z 5 to take some to the fifth embodiment the outer peripheral surface of the sliding shaft portion 2 a of the needle 2, forming a groove 4 3 extending helically.
  • the electric expansion valve Z6 according to the sixth embodiment has a plurality of grooves 44, 44,.
  • the refrigerant flowing between the refrigerant flow path 9 and the internal space 30 passes through the needle fitting gap 17.
  • each groove 4 3 since the groove 43 or the groove 44 is formed on the outer peripheral surface of the needle 2 facing the needle insertion gap 17, each groove 4 3, The part facing 44 has a larger passage area than the other parts.
  • the refrigerant flowing through the needle fitting gap 17 mainly flows through a portion having a large passage area corresponding to each of the grooves 43, 44, and corresponds to each of the grooves 43, 44.
  • Refrigerant flow rates in portions other than the portions relatively decrease. Since the passage area is large at the portions corresponding to the grooves 43 and 44, sludge hardly adheres here. Further, even in a portion other than the portion corresponding to each of the grooves 43 and 44, the amount of the refrigerant flowing therethrough is small, so that even if the gap is narrow, the sludge adheres extremely to the portion. Will be kept low.
  • the groove 43 corresponds to the refrigerant flow reduction means P.
  • the groove 44 is formed. Corresponds to coolant flow reduction means P.
  • the grooves 43 and 44 are not limited to the configuration provided on the outer peripheral surface of the needle 2 as in the fifth and sixth embodiments.
  • the grooves 43, 44 are formed on the inner peripheral surface of the needle fitting hole 16 of the valve body 1, or the outer peripheral surface of the 21 dollar 2 and the 21 dollar fitting hole 1 are formed. Needless to say, it can be formed on both inner peripheral surfaces of FIG.
  • FIG. 8 shows an electric expansion valve Z7 according to a seventh embodiment of the present application.
  • the electric expansion valve Z 7 of the implementation form is obtained by applying the invention of the first 2 of the invention and the first 3 of the present application.
  • Electrically operated expansion valve Z 7 in this embodiment in ⁇ if the gap 2 3 when the refrigerant flows through the ⁇ gap 2 3 between the thread forming portion 1 c and the upper Symbol thread forming member 7 of the valve body 1 The purpose is to prevent sludge from sticking. Therefore, the electric expansion valve Z 7 in this embodiment shaped state is obtained by providing a coolant flow reduction means Q to reduce the refrigerant flow rate through the ⁇ gap 2 3.
  • a ninth embodiment described later from the seventh embodiment specifies a specific configuration of the refrigerant flow rate reducing means Q.
  • Electrically operated expansion valve Z 7 according to the seventh embodiment, it flows out to the end face of the thread forming portion 1 c of the valve body 1 through the ⁇ between 1 7 fitted above twenty-one U.S. dollars from the coolant channel 9
  • the purpose of the present invention is to reduce the amount of the refrigerant flowing into the above-mentioned joint gap 23 side among the refrigerants.
  • an appropriate number of communication holes 45, 45, and 45 are provided in the end face portion 7b of the screw forming member 7 arranged so as to cover the end face side of the screw forming portion 1c of the valve body 1. ... is formed.
  • the refrigerant flowing into the end face portion 7b through the needle fitting gap 17 flows out to the second space portion 32 as it is through the communication holes 45, 45,.
  • the electric expansion valve is configured to relatively reduce the flow rate of the refrigerant flowing into the joint gap 23 by the communication holes 45, 45,... Note that, in the electric expansion valve Z7 of this embodiment, the communication hole 45 corresponds to the refrigerant flow reduction means Q.
  • the narrow combined gap 23 portion is used.
  • the flow rate of the refrigerant flowing therethrough is small, the adhesion of sludge is prevented as much as possible.
  • proper operation (rotational movement and axial movement) of the mouth portion 10 is ensured.
  • proper operation of the electric expansion valve Z 7 is ensured, occurrence of abnormal hydraulic shrinkage or superheated in the compressor in the refrigeration system including the electric expansion valve Z 7 is prevented, high operating The above reliability is obtained.
  • FIG 9 the electric expansion valve Z 8 according to the eighth embodiment of the present application, also in FIG. 1 0 shows the electric expansion valve Z 9 according to a ninth embodiment of the present application respectively.
  • the electric expansion valves Z 8 and Z 9 of each of the embodiments are both to which the twelfth invention and the fifteenth invention of the present application are applied.
  • the specific structure for realizing this that is, the configuration of the refrigerant flow rate reducing means Q) is different from that of the electric expansion valve Z7 of the seventh embodiment.
  • the electric expansion valves Z 8 and Z 9 have a predetermined distance between the fastening member 34 and the end face 7 b of the screw forming member 7 when the needle 2 is fully closed. It utilizes the fact that a gap is created. Specifically, as shown in FIGS. 9 and 10, when the valve head 20 of the two-dollar 2 is seated on the valve seat part 15 of the refrigerant flow passage 9, the further two dollars 2 Is regulated.
  • a refrigerant flow path 49 composed of a plurality of longitudinal grooves is formed.
  • a refrigerant flow path 50 composed of a plurality of spiral grooves is formed.
  • the upper end side of the needle fitting gap 17 (that is, the side communicating with the combined gap 23) communicates with each of the refrigerant flow paths 49, 50. Directly communicates with the second space portion 32 via For this reason, most of the refrigerant that has risen in the needle fitting gap 17 directly flows into the second space portion 32 through the refrigerant flow paths 49 and 50 having a small passage resistance. I do. However, the flow rate of the refrigerant in the combined gap 23 is relatively reduced.
  • the as in the seventh embodiment according electrically operated expansion valve Z 7 of even adopted what even becomes large sludge quantity in the refrigerant or refrigerator oil, a narrow the ⁇ gap 2 3 Sludge is prevented from adhering to the part as much as possible, and proper operation (rotational movement and axial movement) of the above-mentioned roaster 10 is ensured.
  • proper operation of the electric expansion valves Z 8 and Z 9 is ensured. Therefore, in the refrigerating apparatus provided with the electric expansion valves Z 8 and Z 9 , abnormal liquid compression or overheating in the compressor is prevented from occurring, and high operational reliability is obtained.
  • the refrigerant flow path 49 corresponds to the refrigerant flow path 49.
  • the refrigerant flow path 5 corresponds to the refrigerant flow reduction means Q. I do.
  • Embodiment 10 Embodiment 10
  • Embodiment 11 Embodiment 12
  • FIG. 11 shows an electric expansion valve Z! According to a tenth embodiment of the present application.
  • Figure 1 2 To, such electric expansion valve to the first one embodiment of the present application, further 13 shows an electrically operated expansion valve Z 12 according to the twelfth embodiment of the present application respectively.
  • the motor-operated expansion valve Z 1Q , ⁇ , ⁇ , ⁇ 12 of each of the embodiments is an application of the fifteenth invention to the eighteenth invention of the present application.
  • the electric expansion valves Z 1, Zii, and Z 12 are provided between the outer peripheral wall of the case 3 and the outer peripheral surface of the permanent magnet 4 that is located at the outermost periphery of the row portion 10 and is in close proximity to the outer peripheral wall. The purpose is to prevent sludge from adhering to the narrow outer peripheral gap 21 that is formed. Therefore, the electric expansion valve Z, Z II, Z 12 is Ru der those including a refrigerant flow rate lowering means R for reducing the refrigerant flow rate in the outer peripheral gap 21.
  • an electric expansion valve Zi according to a tenth embodiment shown in FIG. are formed in the peripheral wall portion of the permanent magnet 4 so as to pass through it in the axial direction.
  • Each of the refrigerant passages 46 communicates the first space 31 and the second space 32.
  • the electric expansion valve Z! According to the first embodiment shown in FIG. i form refrigerant passages 47, 47,... penetrating in the axial direction through the peripheral wall of the spacer 6 holding the permanent magnet 4.
  • Each of the refrigerant channels 47, 47,... Communicates the first space 31 and the second space 32.
  • the electric expansion valve Z 12 according to the twelfth embodiment shown in FIG. 13, through which the axially abutment surface portion between the scan Bae colonel 6 to embrace this with the permanent magnet 4 Are formed.
  • Each of the refrigerant flow paths 48, 48,... Communicates the first space 31 and the second space 32.
  • the refrigerant flow path 48 is not limited to the refrigerant flow path provided on the outer peripheral surface of the spacer 6 as in the twelfth embodiment.
  • the coolant flow path 48 can be provided on the inner peripheral surface of the permanent magnet 4 or provided on both the permanent magnet 4 and the spacer 6.
  • each of the refrigerant flow paths 46, 47, and 48 corresponds to the refrigerant flow reduction means R.
  • the electric expansion valve z, ⁇ z 12 of the embodiment shows an example of preventing sludge adhesion between narrow gap sludge adhesion is concerned individually.
  • the electric expansion valve Z! To Z 12 in the above embodiments is a sludge adhesion of the needle fit ⁇ between 17 and the peripheral clearance 21 and the ⁇ gap 23 prevents separately.
  • the present invention provides the electric expansion valve Z! Of each of the above-described embodiments from the viewpoint of more reliably preventing problems due to sludge adhesion as the whole electric expansion valve.
  • ⁇ Z! The composite structure may be obtained by appropriately combining the configurations shown in FIG. Industrial applicability
  • the electric $ 200 valve for a refrigeration circuit and the refrigeration apparatus including the same according to the present invention are useful for controlling the flow rate of a refrigerant, and particularly suitable for using an HFC refrigerant or the like.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Electrically Driven Valve-Operating Means (AREA)
  • Magnetically Actuated Valves (AREA)
  • Lift Valve (AREA)

Abstract

L'invention concerne un pointeau motorisé pour circuit frigorifique. Le corps du pointeau (1) comporte un conduit du réfrigérant (41) qui réduit le débit du réfrigérant s'écoulant par un circuit d'écoulement du réfrigérant (9) vers un espace intérieur (30) d'un boîtier (3) à travers un dégagement (17) d'un insert du pointeau formé entre l'orifice (16) de l'insert du pointeau et une aiguille (2) insérée dans ledit orifice (16). Lorsque le réfrigérant s'écoule à travers le dégagement (17) de l'insert du pointeau en fonction d'une montée ou d'une baisse de pression du réfrigérant, la boue mélée au réfrigérant qui adhère à la surface de la paroi du dégagement (17) de l'insert du pointeau peut être éliminée par le conduit du réfrigérant (41) en quantité équivalente à une quantité réduite du débit du réfrigérant. On empêche ainsi autant que possible une adhérence de la boue due à un fonctionnement irrégulier de l'aiguille (2), ce qui garantit un fonctionnement normal de l'aiguille (2).
PCT/JP2000/003042 1999-05-12 2000-05-12 Pointeau motorise pour circuit frigorifique et circuit frigorifique equipe du pointeau motorise WO2000070276A1 (fr)

Priority Applications (6)

Application Number Priority Date Filing Date Title
CA002373185A CA2373185A1 (fr) 1999-05-12 2000-05-12 Pointeau motorise pour circuit frigorifique et circuit frigorifique equipe du pointeau motorise
AU46126/00A AU771213B2 (en) 1999-05-12 2000-05-12 Motor-driven needle valve for refrigerating circuit and refrigerating device with the motor-driven needle valve
US09/959,846 US6701744B1 (en) 1999-05-12 2000-05-12 Motor-driven needle valve for refrigerating circuit and refrigerating device with the motor-driven needle valve
EP00927748.4A EP1178270B1 (fr) 1999-05-12 2000-05-12 Pointeau motorisé pour circuit frigorifique et circuit frigorifique équipé du pointeau motorisé
ES00927748.4T ES2663493T3 (es) 1999-05-12 2000-05-12 Válvula de aguja con motor para circuito de refrigeración y dispositivo refrigerante con la válvula de aguja con motor
HK02103865.4A HK1042135A1 (zh) 1999-05-12 2002-05-23 冷凍回路用電動針閥及其具有該針閥的冷凍裝置

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP11/130699 1999-05-12
JP13069999A JP3742853B2 (ja) 1999-05-12 1999-05-12 冷凍回路用電動ニードル弁及びこれを備えた冷凍装置

Publications (1)

Publication Number Publication Date
WO2000070276A1 true WO2000070276A1 (fr) 2000-11-23

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Application Number Title Priority Date Filing Date
PCT/JP2000/003042 WO2000070276A1 (fr) 1999-05-12 2000-05-12 Pointeau motorise pour circuit frigorifique et circuit frigorifique equipe du pointeau motorise

Country Status (9)

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US (1) US6701744B1 (fr)
EP (1) EP1178270B1 (fr)
JP (1) JP3742853B2 (fr)
CN (2) CN2420589Y (fr)
AU (1) AU771213B2 (fr)
CA (1) CA2373185A1 (fr)
ES (1) ES2663493T3 (fr)
HK (1) HK1042135A1 (fr)
WO (1) WO2000070276A1 (fr)

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CN104930241B (zh) * 2014-03-19 2018-09-28 浙江三花智能控制股份有限公司 电子膨胀阀
JP5830567B2 (ja) * 2014-04-23 2015-12-09 株式会社不二工機 電動弁
CN108351035B (zh) * 2015-09-11 2021-06-25 压力生物科技公司 具有节流能力的高压阀
EP3147593B1 (fr) * 2015-09-22 2021-03-17 Honeywell spol s.r.o. Soupape de détente pour un système de compression de vapeur
WO2017169319A1 (fr) * 2016-03-29 2017-10-05 株式会社鷺宮製作所 Vanne électrique et système de cycle de refroidissement
JP6552457B2 (ja) * 2016-06-22 2019-07-31 株式会社鷺宮製作所 電動弁
JP6478958B2 (ja) * 2016-09-02 2019-03-06 株式会社不二工機 制御弁
DE102017106135A1 (de) * 2017-03-22 2018-09-27 ECO Holding 1 GmbH Elektromagnetisches Hydraulikventil
JP6933398B2 (ja) * 2017-11-16 2021-09-08 株式会社不二工機 電動弁
CN108150673B (zh) * 2017-12-26 2018-12-07 广州市力琪金属制品有限公司 一种制冷系统用的四通阀的电磁线圈组件
CN210372066U (zh) * 2019-06-14 2020-04-21 浙江盾安禾田金属有限公司 电子膨胀阀
JP6880111B2 (ja) * 2019-07-01 2021-06-02 株式会社鷺宮製作所 電動弁
CN111022653B (zh) * 2019-11-18 2022-03-22 宁波奥克斯电气股份有限公司 一种电子膨胀阀、调节方法以及空调器
CN111237880A (zh) * 2020-03-02 2020-06-05 青岛海信日立空调系统有限公司 一种热回收多联机
WO2022243409A1 (fr) * 2021-05-19 2022-11-24 Hoerbiger Wien Gmbh Soupape d'arrêt pour compresseur à piston
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FR3147354A1 (fr) * 2023-03-31 2024-10-04 Valeo Systemes Thermiques Vanne de détente, notamment pour fluide réfrigérant

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Also Published As

Publication number Publication date
AU4612600A (en) 2000-12-05
EP1178270A4 (fr) 2009-06-03
EP1178270B1 (fr) 2017-12-27
ES2663493T3 (es) 2018-04-13
AU771213B2 (en) 2004-03-18
US6701744B1 (en) 2004-03-09
HK1042135A1 (zh) 2002-08-02
CN1349606A (zh) 2002-05-15
EP1178270A1 (fr) 2002-02-06
CA2373185A1 (fr) 2000-11-23
JP2000320712A (ja) 2000-11-24
CN100458316C (zh) 2009-02-04
CN2420589Y (zh) 2001-02-21
JP3742853B2 (ja) 2006-02-08

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